Android Open Source - RssReader Add Channel Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * RssReader//from   ww  w .  j  a  va  2 s  .  c  om
 *
 * Copyright (c) 2013-2014 teejoe
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.m2x.rssreader.activity;

import java.io.File;
import java.io.FilenameFilter;

import org.m2x.rssreader.provider.FeedData.FeedColumns;
import org.m2x.rssreader.util.OPML;
import org.m2x.rssreader.util.UiUtils;
import org.m2x.rssreader.Constants;
import org.m2x.rssreader.R;

import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.MenuItem;


/**
 * The Activity to add RSS channels. 
 * @author teejoe(mtjm2x@gmail.com)
 *
 */
public class AddChannelActivity extends SherlockActivity implements
    View.OnClickListener{
  
  private EditText mFeedTitle;
  private EditText mFeedUrl;  
  
  private Button mImportFromOpml;
  private Button mExportToOpml;

  @Override
  public void onCreate(Bundle savedInstanceState){
    UiUtils.setPreferenceTheme(this);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_channel);
    
    mFeedTitle = (EditText) findViewById(R.id.edit_feed_title);
    mFeedUrl = (EditText) findViewById(R.id.edit_feed_url);
    mImportFromOpml = (Button) findViewById(R.id.import_from_opml);
    mExportToOpml = (Button) findViewById(R.id.export_to_opml);
    
    mImportFromOpml.setOnClickListener(this);
    mExportToOpml.setOnClickListener(this);
    findViewById(R.id.btn_cancel).setOnClickListener(this);
    findViewById(R.id.btn_ok).setOnClickListener(this);

    
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem menuItem) {
      switch (menuItem.getItemId()) {
      case android.R.id.home:
        finish();
        return true;
      }
      
      return (super.onOptionsItemSelected(menuItem));
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.import_from_opml:
      importFromOpml();
      break;
    case R.id.export_to_opml:
      exportToOpml();
      break;
    case R.id.btn_cancel:
      finish();
      break;
    case R.id.btn_ok:
      addRssChannel();
      finish();
      break;
    }
  }
  
  /** Add a RSS channel by a given URL and title. */
  private void addRssChannel() {
        String url = mFeedUrl.getText().toString();
        if (url.equals(""))  return;

        // Add HTTP scheme if not set.
        if (!url.startsWith(Constants.HTTP_SCHEME) && !url.startsWith(Constants.HTTPS_SCHEME)) {
            url = Constants.HTTP_SCHEME + url;
        }

        // Check if the channel exists, if not exist, insert it into the database.
        ContentResolver cr = getContentResolver();
        Cursor cursor = cr.query(FeedColumns.CONTENT_URI, null, FeedColumns.URL + 
            Constants.DB_ARG, new String[]{url}, null);
        if (cursor.moveToFirst()) {
            cursor.close();
            Toast.makeText(this, R.string.error_feed_url_exists, Toast.LENGTH_LONG).show();
        } else {
            cursor.close();
            ContentValues values = new ContentValues();

            values.put(FeedColumns.URL, url);
            values.putNull(FeedColumns.ERROR);

            String name = mFeedTitle.getText().toString();

            if (name.trim().length() > 0) {
                values.put(FeedColumns.NAME, name);
            }
            cr.insert(FeedColumns.CONTENT_URI, values);
        }
  }
  
  /** Import RSS channels from a OPML file. */
  private void importFromOpml() {
    if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) 
        && !Environment.getExternalStorageState()
        .equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {

      Toast.makeText(this, getString(R.string.storage_can_not_access), Toast.LENGTH_LONG).show();
      return;
    }
    
    // Show a file choose dialog to pick up the OPML file.
    final AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(R.string.choose_opml_file);
    
    try {
      final String[] fileNames = Environment.getExternalStorageDirectory().list(
          new FilenameFilter() {
        public boolean accept(File dir, String filename) {
          return new File(dir, filename).isFile();
        }
      });
      
      builder.setItems(fileNames, new DialogInterface.OnClickListener()  {
        public void onClick(DialogInterface dialog, int which) {
          try {
            OPML.importFromFile(new StringBuilder(Environment
                .getExternalStorageDirectory().toString()).append(File.separator)
                .append(fileNames[which]).toString());
          } catch (Exception e) {
            Toast.makeText(AddChannelActivity.this, getString(R.string.error), 
                Toast.LENGTH_LONG).show();
          }
          finish();
        }
      });
      builder.show();
    } catch (Exception e) {
      Toast.makeText(this, getString(R.string.error), Toast.LENGTH_LONG).show();
    }
  }
  
  /** Export the current RSS channels to a default OPML file. */
  private void exportToOpml() {
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) 
        ||Environment.getExternalStorageState()
        .equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {
      try {
        String filename = new StringBuilder(Environment.getExternalStorageDirectory()
            .toString()).append("/rssreader_backup").append(".opml").toString();
        
        OPML.exportToFile(filename);
        Toast.makeText(this, getString(R.string.opml_export_to) + filename, 
            Toast.LENGTH_LONG).show();
      } catch (Exception e) {
        Toast.makeText(this, getString(R.string.error), Toast.LENGTH_LONG).show();
      }
    } else {
      Toast.makeText(this, getString(R.string.storage_can_not_access), Toast.LENGTH_LONG)
          .show();
    }
  }
}

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